I bought the soundtracks at link a couple of years back (JUST before the show hit US shores). I had seen a few episodes of it on a video that my brother had an REALLY liked the show and the music. If they don't still have it there, Drop me a line.
I'm an anime fan, obviously (but everyone knew that already!)
I've never heard Big O, to be honest.
Btw. my favourite anime themes are:
Urusei Yatsura - Lum's Love Song
Urusei Yatsura - Rock The Planet (by Steffanie Borges)
Ranma 1/2 - So Many Memories
Inu Yasha - Grip! (by Every Little Thing)
...and a few other ones I'm too lazy to mention right now :P
Dan: yeah the website you gave didn't seem to have it anymore 0_o, guess I'll check ebay.
Bebop has awesome music.
Trigun I can't really remember the music since cartoon network put it on at like 1:30 on saturdays, I ordered a set though, so maybe after I start watching it again I'll have an opinion.
FLCL was good too, I have both OSTS form that, the pillows are great, I also like all the music refrences in it.
Even though I'm not into techno type stuff that much, I really enjoyed the soundtrack for Ghost In The Shell : Stand Alone Complex, It was done by the same person as bebeop, sounds completely different through.
I believe the Bebop team also worked on Wolf's Rain and Rahxephon, and I know the theme for Rah Xephon was composed by the same person as bebop (her names slips my mind at the moment).
Im really really fond of Gravitation's music (for example, SPICY MARMALADE). Yeah :-3 it may just be because I'm a complete dance freak, but whatever.
I don't actually listen to much Anime music as opposed to J-rock in general.
I have a request for any of you guys who may be able to help me out here:
Seeing as I just got a new job, I'm already trying once again to collect some rare anime records. If anyone could help me out with finding records from these two series (especially the 2nd one), I'd be really happy:
Urusei Yatsura (except for the LP's "Music Capsule", "Only You BGM", and "Music Capsule 2", and the singles "Kage Fumi no Waltz", "Lum no Ballad", and "Born To Be Free")